Region surrounding NGC1999 in Orion
Characteristics:
Magnitude: 9.0 (for NGC 1999 itself)
Size: ?
Distance: about 1,500 light years
RA: 5h 36m 25s
Dec: Minus 6 degrees 42' 57"
Description:
NGC1999 is the small, bluish
reflection nebula located below center in this image, surrounded by an
outwardly expanding region of Ha-emitting gas. There is a
triangular shaped region of dense dust within NGC1999 that can be
better appreciated on higher magnification,
as well as in this Hubble
image. This entire region is a very active star forming
factory, with multiple Herbig-Haro
objects which represent bow shocks induced by vigorous jets of gas
emitted by unstable protostars. Richard Crisp has outlined
several Herbig-Haro objects in this region on his webpage,
and many of these can be seen in the above image. Please click here
for a detailed description of this interesting region.
Photographic Details:
Date: February 5 and 6, 2005
Scope: Takahashi
Sky 90 at f4.5 with field flattener/focal reducer, on the G11 Losmandy
Mount.
Autoguider: SBIG STV with
e-finder.
Camera: SXV-H9
Filter: Astronomik
Ha filter (13 nm bandpass); Type II R, G, B filter set.
Exposures: Ha:(HaR:G:B).
45 x 5' for Ha (3.75 hours total for Ha, unbinned); 5 x 3' each for R,
G, and B (binned 2x2).
Conditions: Temperature 28 degrees F; above average
transparency; average seeing; calm.
Post-processing: No darks,
flats, or bias frames used. Autoaligned in Maxim.
Sigma
combined using RC Sigma Reject Plug-in for MaximDL. DDP was
performed in ImagesPlus
(IP). Subsequent
levels and curves adjustments in Photoshop CS (16 bit format).
Selective use of Neat Image for smoothing. Ha
was combined with RGB using the technique of Luminance
Corrected RGB. Even though the Ha exposure was quite deep,
this region is full of faint nebulosity that could have used an even
longer exposure. Notice the delicate tendrils of gas in the upper
right hand portion of the image.
Please
note: Graphics on this website
may not be reproduced without author permission.
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